Early sodium and fluid intake and severe intraventricular hemorrhage in extremely low birth weight infants

Area of Science:

• Neonatal Medicine
• Pediatric Neurology
• Critical Care

Background:

• Hypernatremic dehydration is a known cause of intracranial hemorrhage.
• A potential link between intraventricular hemorrhage (IVH), hypernatremia, and high sodium intake in preterm infants has been proposed.

Purpose of the Study:

• To examine the association between early fluid and sodium intake, serum sodium concentrations, and severe IVH in extremely low birth weight (ELBW) infants.

Main Methods:

• Retrospective review of medical records for 169 inborn ELBW infants.
• Data collected included daily fluid/sodium intake, urine output, weight loss, and serum sodium levels during the first 4 days of life.
• Infants were categorized into severe IVH (grade 3/4) and control (no or grade 1/2 IVH) groups.

Main Results:

• No significant differences in maximum serum sodium concentration or hypernatremia incidence between groups.
• Strong association found between total fluid and sodium intake in the first four days and severe IVH risk.
• Sodium intake alone, not fluid intake, could discriminate severe IVH risk (excluding transfusions).

Conclusions:

• Early high sodium intake, rather than fluid intake or serum sodium levels, is associated with severe IVH in ELBW infants.
• Randomized controlled trials are necessary to establish a causal relationship.